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La Barbera, A.; Riccardi, B.; Donato, A.; Nannetti, C.A.; Moreschi, L.F., E-mail: riccardi@frascati.enea.it2001
AbstractAbstract
[en] The physico-chemical stability of a commercial 3D SiCf/SiC composite provided with an outer CVD SiC protective layer was studied after exposure to flowing helium with 0.1% H2 at 800 deg. C in contact with lithium silicate and lithium titanate. Exposure tests were carried out for 216, 1000 and 10 000 h in an especially designed loop. The mechanical characteristics of the SiCf/SiC composite in contact with Li4SiO4 were almost unaffected by the exposure, while those in contact with Li2TiO3 were slightly worsened. SiC coating transformation was clearly detected on samples exposed to both lithium silicate and titanate
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S0022311501004871; Copyright (c) 2001 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: Romania
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[en] We report temporal and spectral analysis of two Be/X-ray systems observed by the BeppoSAX NFI. EXO 0531-66 was in outburst during the BeppoSAX observation: it is not a well known source because it is not detectable during the low states and the outbursts are unforeseeable and at temporal distances of years. X Persei is a well known source, but the broad band spectrum, obtained for the first time from the BeppoSAX observation, revealed an unexpected complexity
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Workshop on the active X-ray sky: Results from BeppoSAX and RXTE; Rome (Italy); 21-24 Oct 1997; S0920563298002175; Copyright (c) 1999 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] Information on the chemical compatibility between Li ceramic breeders and reactor structural materials is an important issue for fusion reactor technology. In this work, Eurofer samples were placed inside a Li ceramic pebble bed and kept at 600 deg. C under a reducing atmosphere obtained by the flow of a purging gas (He + 0.1vol.%H2). Titanate and orthosilicate Li pebble beds were used in the experiments and exposure time ranged from 50 to 2000 h. Surface chemical reactions were investigated with nuclear microprobe techniques. The orthosilicate pebbles present chemical reactions even with the gas mixture, whereas for the samples in close contact with Eurofer there is evidence of Eurofer elemental diffusion into the pebbles and the formation of different types of compounds. Although the titanate pebbles used in the chemical compatibility experiments present surface alterations with increasing surface irregularities along the annealing time, there is no clear indication of Eurofer constituents diffusion
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ICFRM-11: 11. International conference on fusion reactor materials; Kyoto (Japan); 7-12 Dec 2003; S0022311504003885; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] The 'Electrochemical Potentiokinetic Reactivation' method has been employed to quantify the degree of intergranular corrosion of Alloy 800, with different Ti + Al content, aged in the range 500-6500C for times up to 5000 hours. The results were compared with the classical Rollason's curves obtained by means of the Strauss' test and a satisfactory agreement was found. An explanation of the slight differences between both methods has been proposed on the basis of the passivity film morphology. (orig.)
[de]
Die elektrochemische potentiokinetische Reaktivierungsmethode wurde benutzt, um das Ausmass der interkristallinen Korrosion von Alloy 800 (unterschiedliche Gehalte an Ti + Al, Waermebehandlung bei 500-6500C, Waermebehandlungsdauer bis 500 Stunden) quantitativ zu ermitteln. Die Ergebnisse wurden mit den klassischen Rollason-Kurven verglichen, die mit dem Strauss-Test ermittelt wurden; dabei ergab sich befriedigende Uebereinstimmung. Um die geringfuegigen Unterschiede zwischen den nach beiden Methoden erhaltenen Ergebnissen zu erklaeren, wird die Morphologie des Passivierungsfilms herangezogen. (orig.)Primary Subject
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Werkstoffe und Korrosion; ISSN 0043-2822; ; v. 32(8); p. 332-337
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Nannetti, C.A.; Riccardi, B.; Ortona, A.; La Barbera, A.; Scafe, E.; Vekinis, G., E-mail: carlo.nannetti@casaccia.enea.it2002
AbstractAbstract
[en] SiCf/SiC composites with true 3D textures were manufactured in order to investigate the effects of the texture on thermal and mechanical properties. Hi-NicalonTM fibre preforms having a total fibre volume content of about 40% with 25 and 50% relative fibre content through the thickness were infiltrated using a mixed chemical vapour infiltration-polymer infiltration and pyrolysis technique. The issues and the main characteristics of the obtained 3D composites are presented and compared with the ones of 2D composites prepared employing the same materials and process
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S002231150200956X; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Countr of input: International Atomic Energy Agency (IAEA)
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[en] The production of heat excess (HE) in electrolytic cells with heavy water and palladium cathodes is, in Cold Fusion, the experiment that has had more confirmations, even though still doubts are cast on its nuclear origin. Furthermore, the correlation of HE with some features of the experiment seems to be well established, the most convincing of which is a threshold in the D/Pd ratio. What is yet not quite clear is how to obtain a high D/Pd ratio, since this feature seems to depend both on the material and on the procedures adopted for the electrolysis. In this paper we will propose a novel approach to this problem, which permits to correlate HE with other features of the experiment. In particular, we try to study the transport of matter across the palladium lattice during the electrolysis. A model, proposed by two of us (ADN e VV), and presented in this Conference, helps to interpret the experimental results, and gives interesting hints for future research. As far as the nuclear nature of the HE is concerned, it seems today clear that the only serious way to address this problem consists in performing experiments in which the presence of 'nuclear ashes' is searched, 4He nuclei being the most likely to be found. Such an experiment has been performed once, and needs confirmation. We plan to perform an experiment in which the production of 4He nuclei can be detected in the gases evolving from the electrolytic cell, in coincidence with the production of HE. A cryogenic system able to separate 4He from other gases, including D2, has been designed, and preliminary data on its behaviour are presented. (author)
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Ikegami, Hideo (ed.) (National Inst. for Fusion Science, Nagoya (Japan)); 712 p; 1993; p. 365-371; Universal Academy Press, Inc; Tokyo (Japan); 3. international conference on cold fusion; Nagoya (Japan); 21-25 Oct 1992
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ELEMENTS, ENTHALPY, HYDROGEN COMPOUNDS, HYDROGEN ISOTOPES, ISOTOPES, LIGHT NUCLEI, METALS, NONMETALS, NUCLEAR REACTIONS, NUCLEI, NUCLEOSYNTHESIS, ODD-ODD NUCLEI, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, PLATINUM METALS, RARE GASES, STABLE ISOTOPES, SYNTHESIS, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENTS, WATER
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Alves, L.C.; Alves, E.; Silva, M.F. da; Soares, J.C.; Paul, A.; La Barbera, A.; Riccardi, B., E-mail: lcalves@itn1.itn.pt2001
AbstractAbstract
[en] Among the advanced materials with potential interest for applications in fusion technology the SiC/SiCf composites are considered to be one of the most promising. We used microbeam RBS and PIXE techniques to follow the structural changes of several SiC/SiCf samples in contact with lithium orthosilicate and lithium titanate breeders at 800 deg. C for different time intervals. After 216 h of exposure the strongest reaction taking place was the oxidation of the composites. The oxidation rate was faster in the samples exposed to the orthosilicate. Simultaneously, lithium diffuses into all the composites and there is a noticeable loss of carbon. For longer exposure the thickness of the oxide layers extends to values above the depth of ion beam analysis. The formation of Ti-rich precipitates was also observed in the samples in contact with the Li titanate
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S0168583X01003317; Copyright (c) 2001 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms; ISSN 0168-583X; ; CODEN NIMBEU; v. 181(1-4); p. 377-381
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[en] SiC-SiCf ceramic matrix composites (CMC) are candidate structural material for fusion power reactor applications because of their favourable thermo-mechanical and low-activation properties. Among their different manufacturing techniques, present, the most employed ones are chemical vapour infiltration (CVI) and polymer infiltration and pyrolysis (PIP). These two techniques are based on the common principle of filling the porosity among the fibres with SiC resulting from precursor decomposition. CVI process deposits high purity crystalline SiC with good properties onto fibres whereas PIP leaves lower characteristic amorphous SiC with traces of oxygen between fibres. PIP, on the other hand, seems to be much more industrially effective than CVI. In the attempt to maximise the properties and reduce costs, some work has been done on the so called 'hybrid techniques' in which CVI and PIP are both employed. The work performed by ENEA and FN S.p.A. consists of a series of combined CVI-PIP process cycles and the subsequent product characterisation
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S0920379600003100; Copyright (c) 2000 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] We present a sky image and spectra for various orbital phases of Circinus X-1 observed by B-SAX Wide Field Cameras. We suggest that the spectral shape is dependent on the orbital phase
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Workshop on the active X-ray sky: Results from BeppoSAX and RXTE; Rome (Italy); 21-24 Oct 1997; S0920563298002266; Copyright (c) 1999 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] The strong concentration gradients produced during the loading process in palladium hydride are responsible for the well known difficulty in obtaining high loading ratios (H(D)/Pd∼1). Experiments on electrolytic loading of palladium with deuterium have been carried out in which the loading ratio was monitored through a four wire resistance technique. Preliminary results show that dynamic loading strongly affects the maximum ratio achievable. (orig.)
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International symposium on metal hydrogen systems: Fundamentals and applications; Les Diablerets (Switzerland); 25-30 Aug 1996; 4 refs.
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